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c3p0 is an easy-to-use library for making traditional JDBC drivers "enterprise-ready" by augmenting them with functionality defined by the jdbc3 spec and the optional extensions to jdbc2. It provides (DriverManager-based) JDBC drivers with JNDI-bindable DataSources, including DataSources that implement Connection and Statement Pooling, as described by the jdbc3 spec and jdbc2 std extension.

Creating a new connection for each user can be time consuming (often requiring multiple seconds of clock time), in order to perform a database transaction that might take milliseconds. Opening a connection per user can be unfeasible in a publicly-hosted Internet application where the number of simultaneous users can be very large. Accordingly, developers often wish to share a "pool" of open connections between all of the application's current users.

pgpool-II is a middleware that works between PostgreSQL servers and a PostgreSQL database client. It supports connection pooling, Using the replication function enables creating a realtime backup on 2 or more physical disks, so that the service can continue without stopping servers in case of a disk failure, Load balance the queries, It can execute queries in parallel to multiple servers.

Proxool is a Java connection pool. It transparently adds connection pooling to your existing JDBC driver. The performance of database connections could be monitored. It's easy to configure using the JDBC API, XML, or Java property files. It complies with the J2SE standards.

DBBalancer is some sort of middleware that would sit in between of database clients and a server. Currently the only server supported is Postgres, but the architecture is open to embrace more servers in a future. It's a connection pool, a load balancer and a database replicator.

MongoPool is the tool that manages your connections to different clusters, maps databases to clients and allows you to work only with database names without worrying about creating and managing connections. You will never have to create a MongoClient everywhere you want to access a database again which enables you to write beautiful and maintainable code.